鐵樹開花 tiě shù kāi huā

DEFINITIONS

  1. lit. the iron tree blooms (idiom)
  2. a highly improbable or extremely rare occurrence

CHARACTERS

鐵 tiě iron; strong, solid, firm
樹 shù tree; plant; set up, establish
開 kāi open; initiate, begin, start
花 huā
HSK 3
flower; blossoms